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292 lines
38 KiB
HTML
<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Alert · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Launches an alert dialog with the specified title and message."/><meta name="docsearch:version" content="0.63"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Alert · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://reactnative.dev/"/><meta property="og:description" content="Launches an alert dialog with the specified title and message."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/img/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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</script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/prism.css"/><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/"><img class="logo" src="/img/header_logo.svg" alt="React Native"/><h2 class="headerTitleWithLogo">React Native</h2></a><a href="/versions"><h3>0.63</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class=""><a href="/docs/getting-started" target="_self">Docs</a></li><li class=""><a href="/docs/components-and-apis" target="_self">Components</a></li><li class="siteNavGroupActive"><a href="/docs/accessibilityinfo" target="_self">API</a></li><li class=""><a href="/help" target="_self">Community</a></li><li class=""><a href="/blog/" target="_self">Blog</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li><li class=""><a href="https://github.com/facebook/react-native" target="_self">GitHub</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="docsNavContainer" id="docsNav"><nav class="toc"><div class="toggleNav"><section class="navWrapper wrapper"><div class="navBreadcrumb wrapper"><div class="navToggle" id="navToggler"><div class="hamburger-menu"><div class="line1"></div><div class="line2"></div><div class="line3"></div></div></div><h2><i>›</i><span>APIs</span></h2><div class="tocToggler" id="tocToggler"><i class="icon-toc"></i></div></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">APIs<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/accessibilityinfo">AccessibilityInfo</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/alert">Alert</a></li><li class="navListItem"><a class="navItem" href="/docs/animated">Animated</a></li><li class="navListItem"><a class="navItem" href="/docs/animatedvalue">Animated.Value</a></li><li class="navListItem"><a class="navItem" href="/docs/animatedvaluexy">Animated.ValueXY</a></li><li class="navListItem"><a class="navItem" href="/docs/appearance">Appearance</a></li><li class="navListItem"><a class="navItem" href="/docs/appregistry">AppRegistry</a></li><li class="navListItem"><a class="navItem" href="/docs/appstate">AppState</a></li><li class="navListItem"><a class="navItem" href="/docs/devsettings">DevSettings</a></li><li class="navListItem"><a class="navItem" href="/docs/dimensions">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/easing">Easing</a></li><li class="navListItem"><a class="navItem" href="/docs/interactionmanager">InteractionManager</a></li><li class="navListItem"><a class="navItem" href="/docs/keyboard">Keyboard</a></li><li class="navListItem"><a class="navItem" href="/docs/layoutanimation">LayoutAnimation</a></li><li class="navListItem"><a class="navItem" href="/docs/linking">Linking</a></li><li class="navListItem"><a class="navItem" href="/docs/panresponder">PanResponder</a></li><li class="navListItem"><a class="navItem" href="/docs/pixelratio">PixelRatio</a></li><li class="navListItem"><a class="navItem" href="/docs/platformcolor">PlatformColor</a></li><li class="navListItem"><a class="navItem" href="/docs/share">Share</a></li><li class="navListItem"><a class="navItem" href="/docs/stylesheet">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/docs/systrace">Systrace</a></li><li class="navListItem"><a class="navItem" href="/docs/transforms">Transforms</a></li><li class="navListItem"><a class="navItem" href="/docs/vibration">Vibration</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Hooks</h4><ul><li class="navListItem"><a class="navItem" href="/docs/usecolorscheme">useColorScheme</a></li><li class="navListItem"><a class="navItem" href="/docs/usewindowdimensions">useWindowDimensions</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Android APIs</h4><ul><li class="navListItem"><a class="navItem" href="/docs/backhandler">BackHandler</a></li><li class="navListItem"><a class="navItem" href="/docs/permissionsandroid">PermissionsAndroid</a></li><li class="navListItem"><a class="navItem" href="/docs/toastandroid">ToastAndroid</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">iOS APIs</h4><ul><li class="navListItem"><a class="navItem" href="/docs/actionsheetios">ActionSheetIOS</a></li><li class="navListItem"><a class="navItem" href="/docs/dynamiccolorios">DynamicColorIOS</a></li><li class="navListItem"><a class="navItem" href="/docs/settings">Settings</a></li></ul></div></ul></div></div></section></div><script>
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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/alert.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Alert</h1></header><article><div><span><p>Launches an alert dialog with the specified title and message.</p>
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<p>Optionally provide a list of buttons. Tapping any button will fire the respective onPress callback and dismiss the alert. By default, the only button will be an 'OK' button.</p>
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<p>This is an API that works both on Android and iOS and can show static alerts. To show an alert that prompts the user to enter some information, see <code>AlertIOS</code>; entering text in an alert is common on iOS only.</p>
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<h3><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h3>
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<div class="toggler">
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<ul role="tablist" class="toggle-syntax">
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<li id="functional" class="button-functional" aria-selected="false" role="tab" tabindex="0" aria-controls="functionaltab" onclick="displayTabs('syntax', 'functional')">
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||
Function Component Example
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||
</li>
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||
<li id="classical" class="button-classical" aria-selected="false" role="tab" tabindex="0" aria-controls="classicaltab" onclick="displayTabs('syntax', 'classical')">
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Class Component Example
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||
</li>
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</ul>
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</div>
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<p><block class="functional syntax" /></p>
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||
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { useState } <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>;
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<span class="hljs-keyword">import</span> { View, StyleSheet, Button, Alert } <span class="hljs-keyword">from</span> <span class="hljs-string">"react-native"</span>;
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<span class="hljs-keyword">const</span> App = <span class="hljs-function">() =></span> {
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<span class="hljs-keyword">const</span> createTwoButtonAlert = <span class="hljs-function">() =></span>
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Alert.alert(
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<span class="hljs-string">"Alert Title"</span>,
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<span class="hljs-string">"My Alert Msg"</span>,
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[
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{
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<span class="hljs-attr">text</span>: <span class="hljs-string">"Cancel"</span>,
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<span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Cancel Pressed"</span>),
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<span class="hljs-attr">style</span>: <span class="hljs-string">"cancel"</span>
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},
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{ <span class="hljs-attr">text</span>: <span class="hljs-string">"OK"</span>, <span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"OK Pressed"</span>) }
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],
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{ <span class="hljs-attr">cancelable</span>: <span class="hljs-literal">false</span> }
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);
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<span class="hljs-keyword">const</span> createThreeButtonAlert = <span class="hljs-function">() =></span>
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Alert.alert(
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<span class="hljs-string">"Alert Title"</span>,
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<span class="hljs-string">"My Alert Msg"</span>,
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[
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{
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<span class="hljs-attr">text</span>: <span class="hljs-string">"Ask me later"</span>,
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<span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Ask me later pressed"</span>)
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},
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{
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<span class="hljs-attr">text</span>: <span class="hljs-string">"Cancel"</span>,
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||
<span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Cancel Pressed"</span>),
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<span class="hljs-attr">style</span>: <span class="hljs-string">"cancel"</span>
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},
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{ <span class="hljs-attr">text</span>: <span class="hljs-string">"OK"</span>, <span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"OK Pressed"</span>) }
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],
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{ <span class="hljs-attr">cancelable</span>: <span class="hljs-literal">false</span> }
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);
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<span class="hljs-keyword">return</span> (
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<span class="xml"><span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.container}</span>></span>
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<span class="hljs-tag"><<span class="hljs-name">Button</span> <span class="hljs-attr">title</span>=<span class="hljs-string">{</span>"<span class="hljs-attr">2-Button</span> <span class="hljs-attr">Alert</span>"} <span class="hljs-attr">onPress</span>=<span class="hljs-string">{createTwoButtonAlert}</span> /></span>
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<span class="hljs-tag"><<span class="hljs-name">Button</span> <span class="hljs-attr">title</span>=<span class="hljs-string">{</span>"<span class="hljs-attr">3-Button</span> <span class="hljs-attr">Alert</span>"} <span class="hljs-attr">onPress</span>=<span class="hljs-string">{createThreeButtonAlert}</span> /></span>
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<span class="hljs-tag"></<span class="hljs-name">View</span>></span></span>
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);
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||
}
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||
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<span class="hljs-keyword">const</span> styles = StyleSheet.create({
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<span class="hljs-attr">container</span>: {
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||
<span class="hljs-attr">flex</span>: <span class="hljs-number">1</span>,
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||
<span class="hljs-attr">justifyContent</span>: <span class="hljs-string">"space-around"</span>,
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||
<span class="hljs-attr">alignItems</span>: <span class="hljs-string">"center"</span>
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||
}
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||
});
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||
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<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> App;
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</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
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||
data-snack-name="Alert Function Component Example"
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||
data-snack-description="Example usage"
|
||
data-snack-code="import%20React%2C%20%7B%20useState%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20View%2C%20StyleSheet%2C%20Button%2C%20Alert%20%7D%20from%20%22react-native%22%3B%0A%0Aconst%20App%20%3D%20()%20%3D%3E%20%7B%0A%20%20const%20createTwoButtonAlert%20%3D%20()%20%3D%3E%0A%20%20%20%20Alert.alert(%0A%20%20%20%20%20%20%22Alert%20Title%22%2C%0A%20%20%20%20%20%20%22My%20Alert%20Msg%22%2C%0A%20%20%20%20%20%20%5B%0A%20%20%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%20%20text%3A%20%22Cancel%22%2C%0A%20%20%20%20%20%20%20%20%20%20onPress%3A%20()%20%3D%3E%20console.log(%22Cancel%20Pressed%22)%2C%0A%20%20%20%20%20%20%20%20%20%20style%3A%20%22cancel%22%0A%20%20%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%20%20%7B%20text%3A%20%22OK%22%2C%20onPress%3A%20()%20%3D%3E%20console.log(%22OK%20Pressed%22)%20%7D%0A%20%20%20%20%20%20%5D%2C%0A%20%20%20%20%20%20%7B%20cancelable%3A%20false%20%7D%0A%20%20%20%20)%3B%0A%0A%20%20const%20createThreeButtonAlert%20%3D%20()%20%3D%3E%0A%20%20%20%20Alert.alert(%0A%20%20%20%20%20%20%22Alert%20Title%22%2C%0A%20%20%20%20%20%20%22My%20Alert%20Msg%22%2C%0A%20%20%20%20%20%20%5B%0A%20%20%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%20%20text%3A%20%22Ask%20me%20later%22%2C%0A%20%20%20%20%20%20%20%20%20%20onPress%3A%20()%20%3D%3E%20console.log(%22Ask%20me%20later%20pressed%22)%0A%20%20%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%20%20text%3A%20%22Cancel%22%2C%0A%20%20%20%20%20%20%20%20%20%20onPress%3A%20()%20%3D%3E%20console.log(%22Cancel%20Pressed%22)%2C%0A%20%20%20%20%20%20%20%20%20%20style%3A%20%22cancel%22%0A%20%20%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%20%20%7B%20text%3A%20%22OK%22%2C%20onPress%3A%20()%20%3D%3E%20console.log(%22OK%20Pressed%22)%20%7D%0A%20%20%20%20%20%20%5D%2C%0A%20%20%20%20%20%20%7B%20cancelable%3A%20false%20%7D%0A%20%20%20%20)%3B%0A%0A%20%20return%20(%0A%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%3CButton%20title%3D%7B%222-Button%20Alert%22%7D%20onPress%3D%7BcreateTwoButtonAlert%7D%20%2F%3E%0A%0A%20%20%20%20%20%20%3CButton%20title%3D%7B%223-Button%20Alert%22%7D%20onPress%3D%7BcreateThreeButtonAlert%7D%20%2F%3E%0A%20%20%20%20%3C%2FView%3E%0A%20%20)%3B%0A%7D%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20justifyContent%3A%20%22space-around%22%2C%0A%20%20%20%20alignItems%3A%20%22center%22%0A%20%20%7D%0A%7D)%3B%0A%0Aexport%20default%20App%3B%0A"
|
||
data-snack-platform="web"
|
||
data-snack-supported-platforms=ios,android
|
||
data-snack-preview="true"
|
||
style="
|
||
overflow: hidden;
|
||
background: #fafafa;
|
||
border: 1px solid rgba(0,0,0,.16);
|
||
border-radius: 4px;
|
||
height: 514px;
|
||
width: 100%;
|
||
"
|
||
></div></div></div><p><block class="classical syntax" /></p>
|
||
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { Component } <span class="hljs-keyword">from</span> <span class="hljs-string">"react"</span>;
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||
<span class="hljs-keyword">import</span> { View, StyleSheet, Button, Alert } <span class="hljs-keyword">from</span> <span class="hljs-string">"react-native"</span>;
|
||
|
||
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">App</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
|
||
createTwoButtonAlert = <span class="hljs-function">() =></span>
|
||
Alert.alert(
|
||
<span class="hljs-string">"Alert Title"</span>,
|
||
<span class="hljs-string">"My Alert Msg"</span>,
|
||
[
|
||
{
|
||
<span class="hljs-attr">text</span>: <span class="hljs-string">"Cancel"</span>,
|
||
<span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Cancel Pressed"</span>),
|
||
<span class="hljs-attr">style</span>: <span class="hljs-string">"cancel"</span>
|
||
},
|
||
{ <span class="hljs-attr">text</span>: <span class="hljs-string">"OK"</span>, <span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"OK Pressed"</span>) }
|
||
],
|
||
{ <span class="hljs-attr">cancelable</span>: <span class="hljs-literal">false</span> }
|
||
);
|
||
|
||
createThreeButtonAlert = <span class="hljs-function">() =></span>
|
||
Alert.alert(
|
||
<span class="hljs-string">"Alert Title"</span>,
|
||
<span class="hljs-string">"My Alert Msg"</span>,
|
||
[
|
||
{
|
||
<span class="hljs-attr">text</span>: <span class="hljs-string">"Ask me later"</span>,
|
||
<span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Ask me later pressed"</span>)
|
||
},
|
||
{
|
||
<span class="hljs-attr">text</span>: <span class="hljs-string">"Cancel"</span>,
|
||
<span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Cancel Pressed"</span>),
|
||
<span class="hljs-attr">style</span>: <span class="hljs-string">"cancel"</span>
|
||
},
|
||
{ <span class="hljs-attr">text</span>: <span class="hljs-string">"OK"</span>, <span class="hljs-attr">onPress</span>: <span class="hljs-function">() =></span> <span class="hljs-built_in">console</span>.log(<span class="hljs-string">"OK Pressed"</span>) }
|
||
],
|
||
{ <span class="hljs-attr">cancelable</span>: <span class="hljs-literal">false</span> }
|
||
);
|
||
|
||
render() {
|
||
<span class="hljs-keyword">return</span> (
|
||
<span class="xml"><span class="hljs-tag"><<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{styles.container}</span>></span>
|
||
<span class="hljs-tag"><<span class="hljs-name">Button</span> <span class="hljs-attr">title</span>=<span class="hljs-string">{</span>"<span class="hljs-attr">2-Button</span> <span class="hljs-attr">Alert</span>"} <span class="hljs-attr">onPress</span>=<span class="hljs-string">{this.createTwoButtonAlert}</span> /></span>
|
||
|
||
<span class="hljs-tag"><<span class="hljs-name">Button</span>
|
||
<span class="hljs-attr">title</span>=<span class="hljs-string">{</span>"<span class="hljs-attr">3-Button</span> <span class="hljs-attr">Alert</span>"}
|
||
<span class="hljs-attr">onPress</span>=<span class="hljs-string">{this.createThreeButtonAlert}</span>
|
||
/></span>
|
||
<span class="hljs-tag"></<span class="hljs-name">View</span>></span></span>
|
||
);
|
||
}
|
||
}
|
||
|
||
<span class="hljs-keyword">const</span> styles = StyleSheet.create({
|
||
<span class="hljs-attr">container</span>: {
|
||
<span class="hljs-attr">flex</span>: <span class="hljs-number">1</span>,
|
||
<span class="hljs-attr">justifyContent</span>: <span class="hljs-string">"space-around"</span>,
|
||
<span class="hljs-attr">alignItems</span>: <span class="hljs-string">"center"</span>
|
||
}
|
||
});
|
||
|
||
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> App;
|
||
</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
|
||
data-snack-name="Alert Class Component Example"
|
||
data-snack-description="Example usage"
|
||
data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20View%2C%20StyleSheet%2C%20Button%2C%20Alert%20%7D%20from%20%22react-native%22%3B%0A%0Aclass%20App%20extends%20Component%20%7B%0A%20%20createTwoButtonAlert%20%3D%20()%20%3D%3E%0A%20%20%20%20Alert.alert(%0A%20%20%20%20%20%20%22Alert%20Title%22%2C%0A%20%20%20%20%20%20%22My%20Alert%20Msg%22%2C%0A%20%20%20%20%20%20%5B%0A%20%20%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%20%20text%3A%20%22Cancel%22%2C%0A%20%20%20%20%20%20%20%20%20%20onPress%3A%20()%20%3D%3E%20console.log(%22Cancel%20Pressed%22)%2C%0A%20%20%20%20%20%20%20%20%20%20style%3A%20%22cancel%22%0A%20%20%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%20%20%7B%20text%3A%20%22OK%22%2C%20onPress%3A%20()%20%3D%3E%20console.log(%22OK%20Pressed%22)%20%7D%0A%20%20%20%20%20%20%5D%2C%0A%20%20%20%20%20%20%7B%20cancelable%3A%20false%20%7D%0A%20%20%20%20)%3B%0A%0A%20%20createThreeButtonAlert%20%3D%20()%20%3D%3E%0A%20%20%20%20Alert.alert(%0A%20%20%20%20%20%20%22Alert%20Title%22%2C%0A%20%20%20%20%20%20%22My%20Alert%20Msg%22%2C%0A%20%20%20%20%20%20%5B%0A%20%20%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%20%20text%3A%20%22Ask%20me%20later%22%2C%0A%20%20%20%20%20%20%20%20%20%20onPress%3A%20()%20%3D%3E%20console.log(%22Ask%20me%20later%20pressed%22)%0A%20%20%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20%20%20text%3A%20%22Cancel%22%2C%0A%20%20%20%20%20%20%20%20%20%20onPress%3A%20()%20%3D%3E%20console.log(%22Cancel%20Pressed%22)%2C%0A%20%20%20%20%20%20%20%20%20%20style%3A%20%22cancel%22%0A%20%20%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%20%20%7B%20text%3A%20%22OK%22%2C%20onPress%3A%20()%20%3D%3E%20console.log(%22OK%20Pressed%22)%20%7D%0A%20%20%20%20%20%20%5D%2C%0A%20%20%20%20%20%20%7B%20cancelable%3A%20false%20%7D%0A%20%20%20%20)%3B%0A%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%20%20%3CButton%20title%3D%7B%222-Button%20Alert%22%7D%20onPress%3D%7Bthis.createTwoButtonAlert%7D%20%2F%3E%0A%0A%20%20%20%20%20%20%20%20%3CButton%0A%20%20%20%20%20%20%20%20%20%20title%3D%7B%223-Button%20Alert%22%7D%0A%20%20%20%20%20%20%20%20%20%20onPress%3D%7Bthis.createThreeButtonAlert%7D%0A%20%20%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20justifyContent%3A%20%22space-around%22%2C%0A%20%20%20%20alignItems%3A%20%22center%22%0A%20%20%7D%0A%7D)%3B%0A%0Aexport%20default%20App%3B%0A"
|
||
data-snack-platform="web"
|
||
data-snack-supported-platforms=ios,android
|
||
data-snack-preview="true"
|
||
style="
|
||
overflow: hidden;
|
||
background: #fafafa;
|
||
border: 1px solid rgba(0,0,0,.16);
|
||
border-radius: 4px;
|
||
height: 514px;
|
||
width: 100%;
|
||
"
|
||
></div></div></div><p><block class="endBlock syntax" /></p>
|
||
<h2><a class="anchor" aria-hidden="true" id="ios"></a><a href="#ios" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>iOS</h2>
|
||
<p>On iOS you can specify any number of buttons. Each button can optionally specify a style, which is one of 'default', 'cancel', or 'destructive'.</p>
|
||
<h2><a class="anchor" aria-hidden="true" id="android"></a><a href="#android" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Android</h2>
|
||
<p>On Android at most three buttons can be specified. Android has a concept of a neutral, negative and a positive button:</p>
|
||
<ul>
|
||
<li>If you specify one button, it will be the 'positive' one (such as 'OK')</li>
|
||
<li>Two buttons mean 'negative', 'positive' (such as 'Cancel', 'OK')</li>
|
||
<li>Three buttons mean 'neutral', 'negative', 'positive' (such as 'Later', 'Cancel', 'OK')</li>
|
||
</ul>
|
||
<p>By default alerts on Android can be dismissed by tapping outside of the alert box. This event can be handled by providing an optional <code>options</code> parameter, with an <code>onDismiss</code> callback property <code>{ onDismiss: () => {} }</code>.</p>
|
||
<p>Alternatively, the dismissing behavior can be disabled altogether by providing an optional options parameter with the cancelable property set to false i.e. <code>{ cancelable: false }</code>.</p>
|
||
<p>Example usage:</p>
|
||
<pre><code class="hljs css language-jsx"><span class="token comment">// Works on both Android and iOS</span>
|
||
Alert<span class="token punctuation">.</span><span class="token function">alert</span><span class="token punctuation">(</span>
|
||
<span class="token string">'Alert Title'</span><span class="token punctuation">,</span>
|
||
<span class="token string">'My Alert Msg'</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">[</span>
|
||
<span class="token punctuation">{</span>
|
||
text<span class="token operator">:</span> <span class="token string">'Ask me later'</span><span class="token punctuation">,</span>
|
||
<span class="token function-variable function">onPress</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Ask me later pressed'</span><span class="token punctuation">)</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">{</span>
|
||
text<span class="token operator">:</span> <span class="token string">'Cancel'</span><span class="token punctuation">,</span>
|
||
<span class="token function-variable function">onPress</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Cancel Pressed'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
|
||
style<span class="token operator">:</span> <span class="token string">'cancel'</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">{</span> text<span class="token operator">:</span> <span class="token string">'OK'</span><span class="token punctuation">,</span> <span class="token function-variable function">onPress</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'OK Pressed'</span><span class="token punctuation">)</span> <span class="token punctuation">}</span>
|
||
<span class="token punctuation">]</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">{</span> cancelable<span class="token operator">:</span> <span class="token boolean">false</span> <span class="token punctuation">}</span>
|
||
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
</code></pre>
|
||
<hr>
|
||
<h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
|
||
<h2><a class="anchor" aria-hidden="true" id="methods"></a><a href="#methods" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h2>
|
||
<h3><a class="anchor" aria-hidden="true" id="alert"></a><a href="#alert" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>alert()</code></h3>
|
||
<pre><code class="hljs css language-jsx"><span class="token keyword">static</span> <span class="token function">alert</span><span class="token punctuation">(</span>title<span class="token punctuation">,</span> message<span class="token operator">?</span><span class="token punctuation">,</span> buttons<span class="token operator">?</span><span class="token punctuation">,</span> options<span class="token operator">?</span><span class="token punctuation">)</span>
|
||
</code></pre>
|
||
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/accessibilityinfo"><span class="arrow-prev">← </span><span class="function-name-prevnext">AccessibilityInfo</span></a><a class="docs-next button" href="/docs/animated"><span>Animated</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#ios">iOS</a></li><li><a href="#android">Android</a></li><li><a href="#methods">Methods</a><ul class="toc-headings"><li><a href="#alert"><code>alert()</code></a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><div><h5>Docs</h5><a href="/docs/getting-started">Getting Started</a><a href="/docs/tutorial">Tutorial</a><a href="/docs/components-and-apis">Components and APIs</a><a href="/docs/more-resources">More Resources</a></div><div><h5>Community</h5><a href="/help">The React Native Community</a><a href="/showcase">Who's using React Native?</a><a href="https://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a><a href="https://dev.to/t/reactnative" target="_blank">DEV Community</a></div><div><h5>More Resources</h5><a href="/blog">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="https://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2020 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
|
||
</script><script>window.twttr=(function(d,s, id){var js,fjs=d.getElementsByTagName(s)[0],t=window.twttr||{};if(d.getElementById(id))return t;js=d.createElement(s);js.id=id;js.src='https://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js, fjs);t._e = [];t.ready = function(f) {t._e.push(f);};return t;}(document, 'script', 'twitter-wjs'));</script><script>
|
||
document.addEventListener('keyup', function(e) {
|
||
if (e.target !== document.body) {
|
||
return;
|
||
}
|
||
// keyCode for '/' (slash)
|
||
if (e.keyCode === 191) {
|
||
const search = document.getElementById('search_input_react');
|
||
search && search.focus();
|
||
}
|
||
});
|
||
</script><script>
|
||
var search = docsearch({
|
||
|
||
apiKey: '2c98749b4a1e588efec53b2acec13025',
|
||
indexName: 'react-native-versions',
|
||
inputSelector: '#search_input_react',
|
||
algoliaOptions: {"facetFilters":["tags:0.63"],"hitsPerPage":5}
|
||
});
|
||
</script></body></html> |